First, this includes people who signed up for Medicare, which is a good chunk of the state exchange signups to date. Signing uninsured up for Medicare is meaningless, as they don't even need to be signed up to get the benefit (a hospital will enroll them if they were to come in for a visit).

Second, this is either very good news or very bad news for the Administration.

If true, which I seriously doubt, it would mean that the exchanges are a wild success. A 21% conversion rate would be awesome even for a private retail web site, and would likely imply over a million enrollments in October.

However, there is a very good chance that in fact this is very bad news. Since this is based on survey data, it means that 21% THINK they enrolled. But what very well may have happened is that they eventually were successful in creating a user account, and believe that having an exchange user account means they are enrolled for insurance, which is clearly not true.